ChenMa

Hi Everyone, I want to transformate one dem in EPSG:4326 to EPSG:3857. The EPSG:3857 is the WGS84 web mercator. The function is 'Coordinate Transformation (Gird)' which under the tool's projection's Proj.4. In the saga gis gui, I only need input the authority code 3857 through this function's input surface. And I want to do it using the windows command line. My input command line is following: saga_cmd pj_proj4 "Coordinate Transformation (Grid)" -SOURCE="E:\dem1.sgrd" -GRID="E:\dem2.sgrad" -CRS_METHOD=1...

Hi Olaf, You made me understand the reason. Thank you very much! Chen

Hi Everyone, I resolved the problem by using the function named UTM projection (Grid) to translate the DEM before the computation of TPI.

Hi Everyone, I meet a problem when I using the tool 'topographic position index' which is under the category terrain analysis's morphometry. Once the function start working, the usage of memery can not stop increasing. And after a very long time, there is no result. And I tried other function such as the 'Analytical Hillshading' ,'Relative Heights and Slope Positions 'and 'Slope, Aspect, Curvature'. All of the above three functions worked well. My DEM data's volume is 2.3mb. And the size of it is...

Hi Volker, Thanks for your help! My DEM file has some problems, and now it works well ! Chen

Hi everyone, I use the saga_cmd to execute the 'Clip Grid with Polygon' function. My command is following: saga_cmd shapes_grid "Clip Grid with Polygon" -INPUT="E:\dem.sqrd" -OUTPUT="E:\clipped.sqrd" -POLYGONS="E:\shape.shp" -EXTENT=1 And I get the message: Clip Grid With Polygon: could not initialize data objects Error: executing tool [Clip Grid with Polygon] The dem data size is 3M, and the shape file has only one polygon. So I think that it is not caused by the memory. And the function can be...